Checking in changes prior to tagging of version 0.15.

Changelog diff is:

diff --git a/Changes b/Changes
index a7ea62e..cf7ea3b 100644
--- a/Changes
+++ b/Changes
@@ -2,6 +2,10 @@ Revision history for perl module Protocol::WebSocket

 {{$NEXT}}

+0.15 2013-11-03T15:54:47Z
+
+ - Explicitly stringify $payload in _mask() method (Toshio Ito)
+
 0.14 2013-10-14T08:50:38Z

  - Fix Changes file (Neil Bowers)